Hi, the archiving option is without any doubt essential.
We created an interim process for the time being.
We ran verification reports periodically on our contacts emails and reference them with different status codes. Each code then initiates a workflow. For those who are invalid, they are added to a static list that is exported, stored and shared with all concerned parties. We delete all invalid contacts from HubSpot and keep the exported file as a reference.
Cheers,
Elias R.